Rev. and Dear Sir: By reading the enclosed bill, you will see that it is my purpose, on the evening of the 12th instant [i.e., Jan. 12, 1847], to give a lecture, before the citizens of Boston, on the system of instruction which I am introducing into schools, and otherwise before the community. The publishers have been so kind as to make every teacher who may be disposed to attend my lecture, welcome to a copy of the "Memoria technica," which you will perceive is the only ticket of admission to the lecture. ... [electronic resource].